(-)-Arctigenin is a dibenzylbutyrolactone ligand found in the root of Arctium lappa L. It is an inhibitor of topoisomerase II, viral integrase including HIV-1 integrase, PAC-1, TNF-alpha, and nitric oxide secretion. Additionally, (-)-arctigenin displays anti-oxidative, anti-inflammatory, and anti-cancer properties. (-)-Arctigenin has been used in research on cosmetics and pharmaceutical products.

(S)-(+)-6-Methoxy-alpha-methyl-2-naphthaleneacetic acid is more commonly known as naproxen. It is a non-steroidal anti-inflammatory agent and non-selective inhibitor of cyclooxygenase (COX-1 and COX-2). Naproxen has been shown to decrease production of thromboxane B2.

2,2’-Bipyridine is a metalloprotease inhibitor used as a reagent for the colorimetric determination of iron. It is a base used for oxidation-reductions indicators and to confirm the presence of ferrous iron in soils. Additionally, 2,2’-bipyridine is used in transition metal catalysis and aluminum-initiated polymerization. It is a high-affinity iron chelator and may inhibit iron-containing enzymes.

2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) has a variety of applications. DDQ is a deprotection agent for ketals, acetals, and thioacetals. It is a useful electron transfer reagent for synthesis of quinolones and an oxidizing agent used to synthesize steroids. Additionally, DDQ is used with Ph3P to synthesize 1,2-benzisoxazoles.

2,4,6-Tris(2-pyridyl)-1,3,5-triazine or TPTZ is a triazine compound containing 3 pyridyl groups. It is commonly used as a reagent for the spectrophotometric determination of Fe(II) and total Fe. It can also be used to determine the amount of acetaminophen in samples through spectrophotometry.

2,4-Dihydroxybenzoic acid is a resorcylic acid with a large number of applications. It possesses antioxidant, anti-radical and hydrogen peroxide scavenging. It also has potential as a wastewater treatment when activated with ultrasound. As a reagent it has been used to synthesize mycophenolic acid, protein 90 inhibitors and pde4 inhibitors.

2-O-Dodecylglycerol is both a reagent for chemical synthesis and a detergent for lysing cell membranes.

2-Phthalaldehyde (OPA) is a dialdehyde with a variety of uses. As a reagent it is used in sensitive fluorescent assays for amines or sulfhydryls, reacting above their isoelectric point in the presence of thiols and causing fluorescent emission. In high-performance liquid chromatographic separation OPA is used to derivatize amino acids and cytometric measurements of protein thiol groups. OPA also functions as a high-level disinfectant used to sterilize surgical tools and medical instruments.

3,5-Dichloro-2-hydroxybenzenesulfonic acid, disodium salt is a reagent used to produce peroxides when combined with 4-aminoantipyrine. It is also used in quantification of hydrogen peroxide through horseradish peroxidase-mediated conversion of itself and 4-aminoantipyrine to a colored product. Under this principle, it is used to determine uric acid in serum as oxidation of uric acid in a uricase-catalyzed reaction yields hydrogen peroxide.

3,5-Diiodo-L-tyrosine dehydrate is an a substrate in the assay of halogenated tyrosine and thyroid hormones aminotransferase. It is also an intermediate in the synthesis and pathways of thyroid hormone metabolism.